CPO, is an abbreviated term for Charge Point Operator, sometimes referred to as a CSO, Charging Station Operator. This is a company that operates charging station(s) and provides customers or third parties with access to charging stations.
The Charging Station Operator, CSO is also the company that owns one or more charging station(s).
A CPO / CSO is responsible for the technical maintenance, power supply, access and, if applicable, billing for the charging sessions on the infrastructure. They are also responsible for ensuring that the charging station(s) comply with all of the legal requirements.